I love DS, but there are certain things I have noticed that they do certain plots more than once (SPOILERS of course):
1. Barnabas was bricked up twice, once by Reverend Trask in 1968, again by Lamar Trask in 1840.
2. Julia is bitten by a vampire twice, once by Tom Jennings in 1968, again by Roxanne Drew in 1840.
3. David is possessed and controlled twice by ghosts, first by Quentin in 1969 and later on by Gerard Stiles in 1970.
4. Angelique blackmailed Barnabas into marrying her in 1795, and Quentin in becoming engaged to her in 1969.
5. Angelique dashed Rachel Drummond's hopes of a relationship with Barnabas in 1897, posing as his fiancee, she did the same thing again to Roxanne in 1840, only this time she announced herself as his wife.
6. Two witchcraft trials: Vicki in 1795, Quentin in 1840. Both saved from execution at the last moment.
7. Vicki and Desmond were both wounded while escaping from jail.
8. Vicki gets kidnapped not once, not twice, but THREE times....first by Matthew Morgan, then twice by Adam.
Can anyone think of anything else?